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Calculation details
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Calculation report
Includes formulas, assumptions, limitations and identified sources.
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Quick answer#
The brick calculator divides net wall area by the face module of one brick and mortar joint, multiplies by the entered number of wythes, then adds the explicit waste allowance. It also provides an idealized mortar-joint volume and whole mortar-bag count.
Brick calculation formula#
For a rectangular wall, gross area = length × height. Known-area mode skips that step. Net area equals gross area minus the combined area of openings.
The brick face module is (actual brick length + joint) × (actual brick height + joint). Installed bricks equal net area ÷ module area × wythes. Bricks to order equal installed bricks × (1 + waste percentage), rounded upward.
Worked example#
A 20 ft × 8 ft wall with 20 ft² of openings has 140 ft² of net face area. Using a 7⅝ × 2¼ in modular brick face with a ⅜ in joint produces an 8 × 2⅝ in module. One wythe requires approximately 960 installed bricks; adding 5% waste rounds the purchase estimate to 1,008 bricks.
Brick size and mortar joints#
Brick names do not guarantee identical physical dimensions. The Brick Industry Association explains that actual brick size, specified mortar-joint thickness and modular coordination work together. Measure or obtain the data sheet for the product being ordered.
The preset list is only a convenient starting point. Custom dimensions keep the formula usable for local products and nonstandard units.
Mortar estimate#
The theoretical joint volume equals net wall volume minus the solid volume of the installed bricks. Dividing that volume by the entered packaged-mortar yield gives whole bags.
This geometric method cannot predict bond-specific cuts, brick frogs or cores, joint tooling, spillage, absorption, batching or workmanship. Confirm mortar type and yield with the project specification and product manufacturer.
Assumptions and limitations#
The calculator estimates material quantities only. It does not design wall thickness, structural capacity, veneer support, ties, reinforcement, lintels, flashing, drainage, foundations, movement joints or code compliance. Waste and cost are based only on user entries.
Sources and methodology#
- Brick Industry Association Technical Note 10: Dimensioning and Estimating Brick Masonry — brick dimension, modular-coordination and estimating context.
- NIST SP 811 conversion factors — U.S. customary and SI conversions.
- ASTM masonry standards overview — standards context; the calculator does not certify a brick, mortar or assembly.
Sources support the measurement method. Product dimensions, bond, mortar type, yield and construction requirements remain project-specific.